20000642156165 has 16 divisors (see below), whose sum is σ = 26183471832000. Its totient is φ = 14545469896320.

The previous prime is 20000642156137. The next prime is 20000642156197. The reversal of 20000642156165 is 56165124600002.

It is not a de Polignac number, because 20000642156165 - 2¹⁰ = 20000642155141 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3853415 + ... + 7406084.

It is an arithmetic number, because the mean of its divisors is an integer number (1636466989500).

Almost surely, 2^{20000642156165} is an apocalyptic number.

It is an amenable number.

20000642156165 is a deficient number, since it is larger than the sum of its proper divisors (6182829675835).

20000642156165 is a wasteful number, since it uses less digits than its factorization.

20000642156165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11291812.

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 20000642156165 its reverse (56165124600002), we get a palindrome (76165766756167).

The spelling of 20000642156165 in words is "twenty trillion, six hundred forty-two million, one hundred fifty-six thousand, one hundred sixty-five".